地质样品Sr和Nd同位素的化学分离方法改进  

Improvement of the Method for Chemical Separations of Sr and Nd in Geological Samples

作　　者：何连花[1,2] 张俊[1,2] 高晶晶[1,2] 张辉[1,2] 刘季花[1,2] 李华芹 

机构地区：[1]国家海洋局第一海洋研究所,山东青岛266061 [2]海洋沉积与环境地质国家海洋局重点实验室,山东青岛266061 [3]武汉地质矿产研究所,湖北宜昌430205

出　　处：《海洋科学进展》2014年第1期78-83,共6页Advances in Marine Science

基　　金：国家海洋局第一海洋研究所基本科研业务费--末次冰消期以来白令海千年尺度气候变化的海洋沉积记录(GY0213G26)和富钴结壳中铂族元素的相态分析研究及其应用(GY02-2012G35);国家海洋局青年海洋科学基金--富钴结壳中铂族元素的相态分析研究及其应用(2012325);海洋公益性行业科研专项经费--海洋底质环境多元地球化学评价技术及其在典型区的示范应用(201105003)和海上试验场建设技术研究和原型设计(200905024)

摘　　要：多接收器等离子体质谱仪(MC-ICP-MS)高精度同位素组成的准确测定,依赖于对样品中待测元素的分离纯化。改进了Rb-Sr和Sm-Nd化学分离方法,检测AG50W-X12树脂及P507萃淋树脂对Rb-Sr和Sm-Nd的分离效果,并通过测定标准物质中Sr和Nd的同位素组成进行验证。结果表明,AG50W-X12树脂经2次分离能有效去除Rb,满足MC-ICP-MS高精度测定Sr同位素比值的要求;P507萃淋树脂能很好实现Sm-Nd分离,同时去除大部分Ce,满足仪器高精度测定Nd同位素比值的需要。High-accurate determinations of isotope compositions with MC-ICP-MS require an adequate sepa-ration and purification of the elements to be determined in the bulk geological samples. An improved meth-od for chemical separations of Rb-Sr and Sm-Nd in geological samples is presented. The effect of the sepa-rations of Rb-Sr and Sm-Nd is tested by using resins AGSOW-X12 and P507 and validated through the de-terminations of isotope compositions of Sr and Nd in the reference material. The results indicate that： the AG50W-X12 resin can effectively remove Rb through twice of ion exchange chromatography, which meets the requirements of high-accurately determining Sr isotopic ratios with MC-ICP-MS; and the P507 resin can realize very well the separation of Sm-Nd, together with removing most of Ce, which meets the re-quirements of high-accurately determining Nd isotopic ratios with the instrument.

关 键 词：Rb—Sr和Sm—Nd化学分离 Sr和Nd同位素 离子交换层析 

分 类 号：P597[天文地球—地球化学]